[PSUBS-MAILIST] onboard gear

[Sean T. Stevenson via Personal_Submersibles]

Saturation is a different animal entirely.  In sat, your PPO2 is likely kept below 0.4 atm because of the indefinite exposure duration, and your excursion limits change as opposed to surface-oriented (bounce) diving.  A sub escape is ideally a really rapid bounce, blowing down as fast as you can equalize, locking out and ascending as fast as possible when deep, and if at all possible, slowing down a bit as you approach the surface.  Getting on 100% oxygen once you have surfaced is going to be a big help for survivability too. As you say though, blown eardrums (barotrauma), bends (decompression sickness), hypothermia and all the rest are secondary considerations to just getting the hell out and getting to air.

Sean

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Monday, April 22, 2019 2:09 PM, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

> I have a friend that I keep in contact with that was a rack operator back in the day that mixed the gas for the sat systems that I used to be in and was going to have him do the math to get the proper mix and gases so that I wouldn't have the 02 toxicity problems that you speak of. As long as you don't go lower than the 16% PP02 to sustain life and you don't dilly dally at depth which you wouldn't, it should be fine. My flood valve is 2" ID so should flood sub quite quickly but probably going to come away with blown eardrums even though I am really good at clearing my ears. My bailouts are also 30 Cu. Ft.
> Rick
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